I was talking to a building inspector when I applied for a basement finish
permit. I have half of my basement already framed with 2" X 3". The masonry
perimeter basement wall is uneven so the spacing between vertical studs and
the wall varies from almost zero to almost 2". Our township code requires
some fire insulation material to be put between joists and studs as fire
stopping. It can be drywall or plywood or what he called thermofiber. Since
half basement is already framed it is not possible to put drywall or plywood
as firestopping. The inspector suggested me to us thermofiber that can be
just stuck between studs and masonry walls. He said I can get it in
HomeDepot. I have never heard about thermofiber? Do I staple it to studs?
how expensive is it?